One night Collette (Vanessa Paradis) gets a phone call that wasn't intended for her: a woman she's never heard of, who's coming out of prison, asks her to go and pick up her little boy and bring him to meet her at a train station the next day.

The woman's state of panic catches Colette off guard. She picks up the boy called Billy (Vincent Rottiers), who isn't a child at all but very close to being an adult.

In the station, at the appointed time, Colette fails to find Billy's mother, little knowing that Billy has just been orphaned due to the murky business of a debt, which is all he will inherit.

Although Colette doesn't know it yet, Billy's problems have just become hers.

Their lives are now linked...because she is all he has in the world...and he, may be, is all she has too.